The latest one I've found is Addicted to CAS and it's a card-making challenge site. CAS stands for Clean and Simple. I've copied out their card principles here.
The Meaning of CAS
Well, I don't have any arguments with that design philosophy.
The current challenge is to design a card for a man and the challenge codeword is "Masculine".
So I looked through my photographs for colours or designs with man-appeal (whatever that is - maybe not fluffy pinks or sweet bunny rabbits?).
As far as I can remember it was the rather attractive glass door of a bookshop.
Played with it in photo-editor for a while, cropped, swirled, pasted, made some designs, discarded others.
Finally decided on this.
I haven't seen any photo-edited cards in the previous entries and whether this is the first or the last has yet to be discovered. I'll let you know!